Malicious PDF — malware analysis report

Static analysis result for SHA-256 465166d37c4299e1…

MALICIOUS

PDF

93.6 KB Created: 2021-01-13 19:24:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f03beebf3dbaca3d11b45819ec92776 SHA-1: daab0b798725f962059dec72dea9e478684d8eca SHA-256: 465166d37c4299e1516e6c4421f2d9e8f6f795caf91295e857184bbafcc157ea
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to distribute content or phish users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be part of a multi-stage attack involving a password-protected archive, commonly used to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/aws?utm_term=certificado+medico+de+buena+salud+formato
    • https://cdn.sqhk.co/tefulobesa/54sRCx2/t_mobile_doctor_discount.pdf
    • https://cdn.sqhk.co/libarazituw/Oidjdgj/36837408755.pdf
    • https://cdn-cms.f-static.net/uploads/4483365/normal_5fbdc15cc7aba.pdf
    • https://wenajatimox.weebly.com/uploads/1/3/4/4/134480159/dilasoluluzexu_baroxudazo_kewina_wonozavu.pdf
    • https://cdn.sqhk.co/butiluluvuk/cjf7geR/vodeloloxusidetekej.pdf
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5f918d402c8c5.pdf
    • https://static.s123-cdn-static.com/uploads/4383703/normal_5fe4127770fe7.pdf
    • https://cdn.sqhk.co/pesuxitum/hbjj2hd/mi_a1_launcher_apk_download.pdf
    • https://fobabunopana.weebly.com/uploads/1/3/0/9/130969757/2577616.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dewutexorob/stickers_memes_ios.pdf
    • https://s3.amazonaws.com/sesafefanulokam/kilaka.pdf
    • https://s3.amazonaws.com/mupukesunobaga/67206369431.pdf
    • https://s3.amazonaws.com/sabobenuwe/3928455936.pdf
    • https://s3.amazonaws.com/jasadavebaga/airserver_universal_64_bit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f2e.bin
c277bd6345c5ebae493e7a73b70a8f646c1948b2cc87cde165efa40b5acb7768		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2E 5212 bytes
font_01_sfnt_off000140c7.bin
3c16b12a63f87c5c7ae931db33290752e6761eb86eee3dacdfb478ee7a133229		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140C7 11960 bytes

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